Piercing and chamfering machine



Dec. 1, 1959 F. P. sHARPE PIERCING AND CHANFERING MACHINE:

5 Sheets-Sheet 1 A INVENTOR. FREDER/CK ,QSHARP BY r 2 I ,4 -rT/J, I

Filed Oct. 1l. 1954 Dec. 1, 1959 F. P. sHARPE 2,915,164

PIERCING AND CHAMFERING MACHINE Filed oct. 11. 1954 5 sheets-sheet 2 INVENTOR. FREDERICK R SHARPE,

Dec. 1, 1959 F. P. sHARPE 2,915,164

PIERCING AND CHAMFERING MACHINE Filed Oct. 1l. 1954 5 Sheets-Sheet 4 az 4 4 Il); -ll

r 43 33 t* f 55 INVENTOR.

FREDER/CK. P SHA RPE,

ATTYJ.,

Dec. 1, 1959 F. P. sHARPE PIERCING AND CHAMFERING MACHINE 5 Sheets-Sheet 5 Filed Oct. 11, 1954 IN VEN TOR.

yarticles from angular movement kso t device registers with the hole formedby the piercing United States Patenty O PIERCING AND CHAMFERING MACHIN Frederick P. Sharpe, Dearborn, Mich., assignor to Kelsey- Hayes Company, a corporation of Delaware applicati@ october 11, 1954, serial No. 461,429 3 Claims. (Cl. 198-19) I The invention relates to piercing and chamfering machines and refers more particularly to machines for piercing and chamfering tire carrying rims to form chamfered valve stem holes.

The invention has for one of its objects, to provide an automatic piercing and chamfering machine which is reliable and efficient in operation.

lThe invention has for another object to lprovide a piercing and chamfering machine having a guide along which the articles are movable, piercing and chamfering devices spaced longitudinally of the guide, and means for transferring the articles from piercing position to chamfering position, the latter means, serving that the chamfering device. v

YThese and other objects of the invention will become to yhold the apparent from the following description taken in connec-` y.

tion with the accompanying drawings in which- Figure 1 is a plan view of a piercing and chamfering machine embodying the invention;

Figure 2 is a side elevation thereof;

Figures 3, 4, 5 and 6 arevcross-sections on the lines@ .v3- 3, 4*-4, 5-5 and 6-6, respectively, of Figure vl;-`

Figure 7 is a cross-section on the line 7-7 of Figure 3; Figure 8 is a cross section on the line 8-8 of Figure 6; Figure 9 is a schematic wiring diagram;

Figure 10 is a schematic pneumatic diagram.

The piercing and chamfering machine as illustrated is .designedto pierce and chamfer tire carrying rims of the dropv center type to form chamfered valve stem holes. The machine comprises the' frame 1, the downwardly l device comprises the channel-shaped guide 6, the

2,915,164 Patented Dec. 1, 1959 ICC yoke 7 slidable in the guide, the punch 8 secured to the upper varm 9 ofthe yoke, the anvil 10 in axial alignment with the punch, and the hydraulic actuator lltor relatively moving the punch and anvil toward and away from each other and a rim. The yoke7 is resiliently urged 'upwardly' by means of the `coil spring 12 which extends into a bore` in 'the yoke and abuts the yoke at=the end of the bore and which also-extends into an axially aligned bore in the fixture 13 and abuts the head 14 in the latter bore. e The fixture is secured to thelower end ot the guide 6 and the l'head is adjustable by means of the screw 1S threaded in the fixture and abutting the' hfead lwhereby the force ex erted bythe spring may be varied. Upward movement of the yoke is limited by the screw 16 threaded-in the fixture 17 which is secured to the upper end ofthe guide 6.r s

The -hydraulic actuator 11 comprisesthe cylinder `l8 --iixedly secured to the lower arm 19 of the `yoke 7, the piston 20 re'ciprocable within the cylinder and the piston rod 21to the lower endrof which the piston is secured and to lthe upper end of which the anvil 10 is secured. Assuming the parts to be in off position with Vthe punch 8 in its uppermost position and the anvil 10 in its-lwermost position, upon the entrance of liquid under pressure into the lower end of the cylinder 18 below the-piston 20 the piston is raised by the liquid acting on theulower side of the piston therebyraisingthr'ough the -piston rod `2l the anvil 10 aga inst the lower side, wallof the wellofth'e rim and clamping the lower side wall against the bars 4.

The yoke 7 is moved downwardly by the liquid actlng'on the lower-end of the cylinder and the punch 8 is torced through the lower side wall ofthe well thereby forming` the valve stem hole. Then upon exhaust of the liquid from the lower end of the cylinder 18 andentrance of liquid under pressure intov the upper end of the cylinder above the piston 20, the parts are returned by the liquid acting on the upper side of the piston and the upper end of the vcylinder to theirfot positions in whichthey are held by the coil spring l12. l

"To accurately locate the punch 8 and. anvil 10 to move at right angles to the side wall of thewell of the rim. the

and forwardly inclined table 2 on the frame, and the bars 3 and 4 for supporting and guiding the rims duringtheir downward movement under the inuence of gravity. The

bars 3 extend longitudinally of and are mounted on the table and are spaced from eachother a distance less than A .thediameter of the rims to engage the lower edgesof theAl lower beads of the rims. The bars 4 yalso extend longitudinally of the table and are mounted,on the spacers 4 which' are mounted on thetable to clear the rims, the ,bars .4 being spaced lfrom each other to extend over the lower` VK ,tire retaining anges of the rims and to engage thejdia-" metrically oppositeparts ofthe adjacent tire bead seats Y ofthe rims. One of the bars 4V is preferably laterally adjustably mounted on its spacers 4' to provide for accurately spacing the bars 4 from each other.V WithI this con-- struction, the bars 3 and 4 serve to support and guide the rims during their downward movement.

For the purpose of piercing the rims, the piercing device S is provided. This piercing device is ofthe same construction as shown in my copendingapplication Serial N0 ,395.004, led November 30, 1953, Yon liercing` Machine. The device is mounted onrthe frame 1 and table l2 at the side of the latter opposite the laterally adjustablebar 4 to engage the portion of the lower side wall ofthedwell of the rim laterally opposite the rim axis..4 vThe guide 6 is angularly adjustably mounted Von thel trame 1 and table 2. In detail,`22 is a channel-shaped-,bracket secured to the frame and table, and 23 are axially aligned gudgeons extending from ythe side flanges ofthe bracket andpivotally mounting the guide kon the bracket 24' are set screws threaded lin the base of the guide above and below the gudgeons for angularly adjusting the guide about the axes of the gudgeons relative tothe bracket.

To accurately locate the punch 8 and thevanvil l0 to engage the side wall of rvthe well of the rim at the desired radial distance fromthe axis of the rim, I have provided theset screws 25 threaded in the blocks 25'. and abutting vided the stop device 27. This stop device comprises the stop pin 2S extending through the table 2 and the uid Ipressure operated actuator 29 secured to thel under side of the table with its axis offset from the center line of the table. The actuator is adjustable longitudinally of the tableto accurately locate the stop pin to thereby accurately position the rims with respect to the piercing device. The actuator is an air cylinder 30 and piston 31 s reciprocable within the cylinder and connected to the `Stop `operation.

pin. The cylinderis provided with upper and lower ends for the into and from the cylinder.

suitable ports/at its passage of compressed air :For the purpose of .cham'feringthe rims and more parl '.ticularly chamfering the metal of the rims bordering the pierced holes, the chamfering device 32 is provided, `this dlvice being mounted on the frame 1 and table 2 at `t e tance greater than'the diameter of the rim being pierced and-chamfered. The-chamfering device with the exception ofthe punch 33and anvil 34 is of the same construc- `tion'as the piercing device Stand comprises the angularly adjustable channel-shaped guide 35, the yoke 36 slidable in the guide and the hydraulic actuator 37. The hydraulic Vactuator'comprises'thecylinder 38 lixedly secured to the lower arm 390i the yoke 36, the piston 38 reciprocable ,vvithin the cylinder and the piston rod 4t) to the lower yendfof-vvhich the piston is secured and t thei upper end of which the punch 33 is secured. `The anvil 34 'A tothe upper arm 410i the yoke 36. The punch 33 and anvil' 34 are-accurately located to move at right angles is secured to and engage the side wall of the rim at-the desired radial distance from the axis of the rim in the same :manner as theV punchandanvil of the piercing device.A

Y With this construction it will be seen that the rim is piercedto form rthe valve stem hole by means of a punch `movableinthe. well of the rim laterally outwardly with respect to the side wall of the well or downwardly with respect to the table of the machine and that the rim is chamfered by movement of al punch inthe opposite direc- ,tion' so that anyburr which might be formedy by the piercing operation will be removed by the chamfering of positioning the rims for engagement device, I have-provided the stop de- For the purpose by 4,the chamfering vice 42 of the same construction as the stop device 27 and comprising the stop pin 43.extending through the table 2 and the uid pressure operated actuator 44 longitudiknally adjustably secured to the under side of the table. n The actuator is an air cylinder 45'. and piston 46 reciprocable within the cylinder and connected to the stop pin. The cylinder is provided with suitable ports in its upper and lower ends for the passage of compressed air into-l` same side as and below the piercing device 5 a dis- .angular movement so that thechamfering device registers with the hole formed by the piercing device.

To control the operation of the piercing and chamfering machine, I have provided the limit switch 64 which is adapted to be closed by a rim moving downwardly over the table 2 by gravity. The switch is of conventional construction and is secured tothe laterally adjustable bar 4 to locate the actuating arm 65 of the switch in the path of the base 'of the well of the `rim to be engaged by the base just-priorto the engagement of lthe rim with -the stop pin-.23 and swung to position,elos1ing:the switch at the instant the rim engages the stop pin.

As shown schematically in FigureQthe'limit switch 64 is in series withthe normally closed contacts 66 of the time delay 67, the normally closed micro switch 68 of the hydraulic unit 69 and the solenoid of the control relay 70. The time delay, the hydraulic unit, and the control relay arehoused ina panel boxat the side of the piercing and Ychamfering machine.

'The time delay is of the dash pot type and of conventional construction known as the Agastat time delay and in-addition to havingthe normally closed contacts 66 *has the normally open contacts 71.

The hydraulic unit is self-cycling and rof conventional construction known as the Hannan unit. The hydraulic unit controls the flow of liquid under pressure to vthe lower and upper ends of the cylinders 18 and 38 of the piercing and chamfering devices 5 and 32, respectively, and the flow of the liquid from these ends. In operation, the hydraulic unit first supplies liquid under relatively low pressure to the lower ends of the cylinders 18 and 38 below their pistons thereby moving the punches 8 and 33 and their associated anvils 10 and 34 against opposite vsides ofthe lower side wall of the rim well. The hydraulic unit then supplies liquid under relatively high pressure to the lower ends of the cylinders thereby mov- J ing the punches relative to theirassociated anvils to pierce "side wall of the rim well.

and chamber the side wall of the rim well. Then thehydraulic unit supplies liquid under pressure to the upper ends of the cylinders above their pistons and allows the liquid to'ow from the lower ends of the cylinders so that the punches and anvils are withdrawn to clear the lower During the period liquid under relatively high pressure is being supplied to the lower ends 4of the cylinders, the liquid pressure in the hydraulic unit is being' built up and when this pressure becomes predetermined the'micro switch 68 is automatically opened.

-Then liquid under pressure is supplied to the upper ends lof-the cylinders and the piercing and chamfering devices are returned totheir original or starting positions after which-the micro switch is automatically closed.

I'he air cylinder is pivotally connected at its upper end to the bracket A51 which is secured to the lower side of the table at its upperend. The piston isrconnected 4at its lowerend to the slide 52 carried by the guides 53 extending longitudinally of and secured to the under side of the table.

5S and 56 pivoted to the slide and movable from a position engaging the lower bead of the lower tire retaining flange of a rim to a posiand 62 are provided with ports in their opposite ends for the passage o'f'compressedair into and from the cyl- '.inders. With this construction,

y therim is transferred from piercing position to chamfering position and'hel'd from The slide 52 carries the clamp 48 and the fluid. `pressure operated actuator 54 for operating the clamp. lThe clamp comprises the jaws The control relay is of conventional .construction and has the'contactors 72, 73, 74 and 75. The contactor 72 is parallel to the limit switch 64 and the time delay contacts 66 so that when the contacter 72 is'lclosedit shunts the limit switch 64 and the time delay contacts 66 and .holds closed the circuit including the micro switch 68 and the solenoid control relay 70. The

contactor 73 is in series with the solenoid of the time delay l67 so that when this contactor 73 is closed the solenoid of they time delay is energized and opens vthe time delay contacts 66 and c'loses'the time delay contact 71.v The contacto'r 74 is in series with the contacts'l of the time delay 67 and the solenoid of the solenoid valve 76. This solenoid valve is housed in the panel box housing the time delay, the hydraulic unit, and the control relay, and. is a four-way solenoid valve of conven- 'tional construction known as the Ross four-way solenoid valve. The valve controls the ow of compressed air to the Opposite ends of the cylinders 30 and 45 of the stop devices 27 and 42, respectively, the opposite ends of the clamp operating cylinder 62 and the opposite ends of the transfer cylinder 49. The contacter 75is in another circuit including the relay' of the hydraulic unit 69 so that when the contactor 75 is closed the operation of the hydraulic unit is started.

To control the operation of the transfer cylinder 49, I have provided in each of the compressed air lines leading to the ends of the cylinder the air sequence valve 77 and the speed control valve 78. The sequence valve 77 is of conventional construction, such as a Lo-gan or Ross air sequence valve, and controls the timing of ow of air from the end of the cylinder to which is connected the line having the sequence valve. The speed control valve 78 is of conventional construction, such as a Ross speed control valve, and controls the flow of air through the line having the speed control valve.

In operation, as a rim moves downwardly along the table the rim closes the limit switch 64 at the time the rim comes to rest against the stop pin 28. The limit switch closes the solenoid of the control relay 70 and this control relay, upon energization of its solenoid, closes the contactors 72, 73, 74 and 75. When the contactor 73 is closed, the solenoid of the time delay 67 is energized so that the time delay opens the contacts 66 and closes the contacts 71. The contactor 72 having been closed, the circuit including the solenoid of the control relay 70 remains closed. The contactor 74 and the contacts 71 having been closed, the circuit including the solenoid of the solenoid valve 76 is closed and the solenoid is energized, placing the valve in operation to control the flow of compressed air. The contactor 75 having been closed, operation of the hydraulic unit 69 is started to control the ow of liquid under pressure. The arrangement is such that the air and hydraulic cycles are started at the same time.

The solenoid valve first controls the flow of compressed air to the upper ends of the cylinders 30 and 45 and to the rear end of the cylinder 62 to lower the stop pins 28 and 43 and move the clamping jaws 55 and 56 of the clamp 48 into engagement with the lower bead of the rim resting against the stop pin 28, the clamping taking place before the stop pins become fully disengaged from the rim. During this period of time, the hydraulic unit 69 controls the ow of liquid to the lower ends of the cylinders 18 and 38 of the piercing device and chamfering device 32, respectively, to effect the piercing of the rim resting against the stop pin 28. When the liquid in the hydraulic unit reaches a predetermined pressure after the piercing, the micro switch 68 is automatically opened. The parts of the piercing and chamfering devices are then returned to their original positions after which the micro switch is automatically closed. The rearward movement of the piston in the transfer cylinder 49 is then begun, the start of this movement being controlled by the air sequence valve 77 in the line leading to the front end of the cylinder. The speed of movement of this piston is controlled by the speed control valve 78 in the same line. The contactors 72, 73,74 and 75 having been opened by opening of the micro switch, the solenoid valve 76 then controls the movement of compressed air to the lower ends of the cylinders 30 and 45 and the front end of the cylinder 62, the pistons in the cylinders 30 and 4S raising the stop pins 28 and 43 and the piston in the cylinder 62 returning the clamp jaws to olf position releasing the rim. The piston in the transfer cylinder 49 is then returned to its original position as controlled by the air sequence valve 77 and the speed control valve 78 in the line leading to the rear end of the cylinder 49. At this time the parts are in their original positions and in condition for the next cycle of steps, at which time a rim is resting against the stop pin 28 in piercing position and a pierced rim is resting against the stop pin 43 in chamfering position. As a result, during the next cycle one rim is pierced and a pierced rim is chamfered at the same time.

What I claim as my invention is:

l. In a machine for performing successive operations on work pieces of the type including a guide for the work lpieces and work performing devices at spaced work stations along the guide, the combination of stop pins engageable with the work pieces for locating the latter at the work stations, means for moving the stop pins from operative position engageable with the work pieces to inoperative position clearing the work pieces, and means for transferring the work pieces from one station to the other when the stop pin associated with said one station is in inoperative position including a reciprocable clamping device having cooperating jaws for gripping a work piece and means for reciprocating said clamping device, said jaws rmly gripping the work piece to hold it from rotation during transfer.

2. In a machine for performing successive operations on rims of the type including a guide for the rims and work performing devices at spaced work stations along the guide, the combination of stop pins engageable with the rims for locating the latter at the work stations, said stop pins being movable from operative position engageable with the rims to inoperative position clearing the rims, means for transferring the rims from one station to the other when said stop pins are in inoperative position including a reciprocable clamp having jaws movable to gripping and release positions relative to a rim, means for moving said jaws to gripping position relative to a rim at one station and subsequently moving said stop pins to inoperative position, means for moving said clamp with the gripped rim in one direction to transfer the gripped rim to the other station, said jaws firmly gripping the rim to hold it from rotation during transfer, means for returning said stop pins to operative position and for moving said jaws to release position after return of said stop pins to operative position and transfer of the rim to said other station, and means for moving said clamp in the other direction following movement of said jaws to release position.

3. In a machine for performing successive operations on rims of the type including a guide for the rims and work performing devices at spaced worked stations along the guide, the combination of stop pins engageable with the rims for locating the latter at the work stations, said stop pins being movable from operative position engageable with the rims to inoperative position clearing the rims, means for transferring the rims from one station to the other when said stop pins are in inoperative position including a reciprocable clamp'having jaws movable to gripping and release positions relative to a rim, second means for moving said jaws to gripping position relative to a rim at one station and subsequently moving said stop pins to inoperative position, mechanism for moving said clamp with the gripped rim inone direction to transfer the gripped rim to the other station, third means automatically operated in timed relation to and after the operation of said second means for actuating said mechanism, fourth means for returning said stop pins to operative position and for moving said jaws to release position after return of said stop pins to release position and transfer of the rim to said other station, means automatically operated in timed relation to and after the operation of said mechanism for actuating said fourth means, and means for moving said clamp in the other direction following movement of the jaws to release position.

References Cited in the tile of this patent UNITED STATES PATENTS 1,856,726 Poole May 3, 1932 1,993,754 Smith Mar. 12, 1935' 2,005,522 Holm June 18, 1935 2,570,589 Phillips Oct. 9, 1951 2,771,173 Sharpe Nov. 20, 1956 

